package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.config.exception.DeletionNotAllowedException;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.List;

/**
 * Created with IntelliJ IDEA.
 * User: Lin Huisheng
 * Date: 2024/4/28
 * Time: 18:13
 * Description:
 */
@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;

    /**
     * 新增菜品和对应的口味
     *
     * @param dishDTO
     */
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        //向菜品表插入1条数据
        dishMapper.insert(dish);//后绪步骤实现

        //获取insert语句生成的主键值
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);//后绪步骤实现
        }
    }

    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }

    /**
     * 批量删除菜品
     * @param ids
     */
    @Override
    @Transactional//事务注解,当程序中有异常，则回滚事务
    public void deleteBatch(List<Long> ids) {
        //判断当前菜品是否可以删除--是否起售中
        for (Long id : ids) {
            Dish dish =dishMapper.getById(id);
            if (dish.getStatus() == StatusConstant.ENABLE){
                //不能删除，抛出业务异常
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //判断当前菜品是否可以删除--是否被套餐关联
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishId(ids);
        if (setmealIds != null && setmealIds.size() > 0){
            //当前菜品被套餐关联了,不能删除，抛出业务异常
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //删除菜品表中的菜品数据
        /*for (Long id : ids) {
            dishMapper.deleteById(id);
            //删除菜品口味表中的菜品数据
            dishFlavorMapper.deleteByDishId(id);
        }*/

        //根据菜品id批量删除菜品数据
        dishMapper.deleteByIds(ids);

        //根据菜品id批量删除菜品口味数据
        //sql:delete from dish_flavor where dish_id in (?,?,?)
        dishFlavorMapper.deleteByDishIds(ids);
    }

    /**
     * 根据id查询菜品和对应的口味数据
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //1.根据id查询菜品数据
        Dish dish = dishMapper.getById(id);
        //2.根据菜品id查询口味数据
        List<DishFlavor> dishFlavors= dishFlavorMapper.getByDishId(id);
        //3.将2中的2个list封装到DishVO中
        DishVO dishVO = new DishVO();
        //4.将dish中的数据拷贝到dishVO中
        BeanUtils.copyProperties(dish,dishVO);
        //5.将dishFlavors中的数据拷贝到dishVO中
        dishVO.setFlavors(dishFlavors);
        //6.返回dishVO
        return dishVO;
    }

    /**
     * 根据id修改菜品和对应的口味数据
     * @param dishDTO
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //1.修改菜品表基本信息
        dishMapper.update(dish);
        //删除原有的口味信息
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        //重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 根据类别ID列出菜品。
     *
     * @param categoryId 类别的ID，用于查询属于该类别的菜品。
     * @return 返回一个菜品列表，这些菜品属于指定的类别。
     */
    @Override
    public List<Dish> list(Long categoryId) {
        // 创建一个Dish对象，设置类别ID和状态为启用，用于查询条件
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        // 调用dishMapper的list方法，根据条件查询菜品列表并返回
        return dishMapper.list(dish);
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

    //起售停售菜品
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder()
                .status(status)
                .id(id)
                .build();
        dishMapper.startOrStop(dish);
    }
}
